memory.cpp: In function 'void play()':
memory.cpp:6:5: error: 'vector' was not declared in this scope
vector<int> p[26];
^~~~~~
memory.cpp:6:5: note: suggested alternative:
In file included from /usr/include/c++/7/vector:64:0,
from /usr/include/c++/7/functional:61,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:71,
from memory.cpp:1:
/usr/include/c++/7/bits/stl_vector.h:216:11: note: 'std::vector'
class vector : protected _Vector_base<_Tp, _Alloc>
^~~~~~
memory.cpp:6:12: error: expected primary-expression before 'int'
vector<int> p[26];
^~~
memory.cpp:10:9: error: 'p' was not declared in this scope
p[a].push_back(i);
^
memory.cpp:16:16: error: 'p' was not declared in this scope
faceup(p[i][0]); faceup(p[i][1]);
^